What Version of Windows?

Assuming Windows 8

Open Local Security Policy by clicking the Start button Picture of the Start button, typing secpol.msc into the search box, and then clicking secpol.‌ Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

In the left pane, double-click Account Policies, and then click Password Policy.

Double-click the item in the Policy list that you want to change, change the setting, and then click OK.

This may work for Win 7

Mark